(0.5x+2)/0.03-x=[0.3(0.5x+2)]/0.2
0.2(0.5x+2)-0.06x=0.3×0.03(0.5x+2)
0.1x+0.4-0.06x=0.0045x+0.018
0.04x-0.045x=0.018-0.4
-0.005x=-0.22 x=44
解方程.（0.5x+2)/0.03-x=[0.3(0.5x+2)]/0.2
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